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Old 07-08-2006, 06:11 AM   #1
64deville
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Default Building a more Powerful 429 Cadillac Motor

I've got a 429 from 66 Cadillac that I want to build for a project and have some questions. I've had other 429 Cad's but they were good enough that I really didn't want to rebuild them. This one burns oil like crazy and I'm going to tear it down. It was a common motor as it was used in pretty much every Cadillac from 64-67 but there doesn't seem to be much around for increasing power. It has potential as it was rated at 340 hp and I think a torque rating around 390 from the factory with around 10:1 compression. Having owned a few 429's that were factory stock and in better condition than this one I know they can be quite potent.

Cant seem to locate any aftermarket cams, intakes, etc for this motor.

Heres what I had in mind:

Punching the block to .30 or .60 over, getting new pistons, rods etc.
Moving to electronic ignition
Custom cam
Having the heads ported and polished

Also heard of modifying a stock 429 intake to fit a larger Edlebrock carb but I've had pretty good luck with the Quadrajets in the past if they are properly tuned.

Anyone else have any suggestions for this motor. Thanks in advance.
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Old 07-08-2006, 06:29 AM   #2
theHIGHLANDER
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Default Re: Building a more Powerful 429 Cadillac Motor

Regrinding a cam used to be somewhat common. I don't know much on the subject. Beyond that the head clean up and some custom built headers will wake it up. How potent do you want it? I'd shy away from real big valves and focus the head work on the pockets and get the exhaust matched up good. And hell yeah, a patient hot rodder can suck lots of power out of a Q jet. There's 2 "blank" chambers in the main carb body that can open to the main bowl and increase bowl volume (the Q jet's biggest flaw). Keep RPMs to 5000 or less and gear for torque then hang on. Dad and I stuffed many a Caddy into Ford pick ups back in the day. Had a stock 429Caddy in a 62 Ford SWB F100 unibody. I waxed a hopped up 72 Z28 with it in my senior year of HS. It had home built side pipes and a 4.10 gear. The guy was a bit pissed as I recall
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Old 07-08-2006, 06:58 AM   #3
64deville
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Default Re: Building a more Powerful 429 Cadillac Motor

I'm going to do something with the exhaust but I don't know about the headers. They will have to custom units and they will be a pretty tight fit against the frame and block. Planning to get dual Magnaflows (I think) and dump the pipes right behind the rear tires.

Hadn't thought about the gearing. Definately more concerned about torque than overall horsepower as this motor will go into a big heavy Cadillac.
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Old 07-08-2006, 07:16 AM   #4
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Default Re: Building a more Powerful 429 Cadillac Motor

Quote:
Originally Posted by 64deville
I'm going to do something with the exhaust but I don't know about the headers. They will have to custom units and they will be a pretty tight fit against the frame and block. Planning to get dual Magnaflows (I think) and dump the pipes right behind the rear tires.

Hadn't thought about the gearing. Definately more concerned about torque than overall horsepower as this motor will go into a big heavy Cadillac.

Courtney Hines, president of Cad Company, has "been there done that" . His 70 Coupe de Ville does 10s.....regular as clockwork. If he can't help , you can't be helped.

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Old 07-08-2006, 01:51 PM   #5
Toystoretom
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Default Re: Building a more Powerful 429 Cadillac Motor

I have a 66 Sedan DeVille Hardtop with the 429. I replaced the AFB with an Edlebrock 750 and made an adaptor plate from a generic carb adaptor/spacer, and used a chrome Edlebrock air cleaner. The AFB ran OK but it sucked gas like a pig. After I installed the new carb I picked up about 2 mpg IN TOWN and more than that on the highway. It also runs much better, this added several horsepower down low... I can shred the tires at will. I did have to buy the jet kit and rejet the carb... it was too lean at first. Very easy to tune an Edlebrock. I agonized over the 750 cfm being too big for a stock 429, and now that I have it on there I have come to the conclusion you could easily go 850, especially if you ran some sort of custom exhaust. My exhaust is stock, but I am planning to have some custom duals made up. Other than that my 429 is stock, about 77,000 miles and it runs really good.

I am still fighting the driveshaft morons... this week I am going to order a used driveshaft and swap them out to kill my vibes...

Oh... and just to let you know... I have found very little in the way of speed equipment for this. There is an intake but it runs dual quads (can you say 3 miles to the gallon) and it has no provision for the AC compressor. It would be OK in a street rod, but in a Caddy... I don't know.... I'm sure you can get a Pertronix... I'm using the stock points and so good so far. There is a lot more stuff for the later 472/500 Cads..

Hey... you don't have the driveshaft out of that 66 do you?? PM me if you do...

Last edited by Toystoretom; 07-08-2006 at 02:00 PM.
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Old 07-08-2006, 03:29 PM   #6
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Default Re: Building a more Powerful 429 Cadillac Motor

Those 429's will lay a black stripe off the RR tire of a '64 SDV 4D that will be there a year later.

Trust me, I know.

Might make more power w/ headers, duals, and cam...

-bill
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Old 07-08-2006, 04:01 PM   #7
oldcarfart
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Default Re: Building a more Powerful 429 Cadillac Motor

BTDT, just get a 472/500 & TH400 and do a swap, 429's are a money pit.



Quote:
Originally Posted by 64deville
I've got a 429 from 66 Cadillac that I want to build for a project and have some questions. I've had other 429 Cad's but they were good enough that I really didn't want to rebuild them. This one burns oil like crazy and I'm going to tear it down. It was a common motor as it was used in pretty much every Cadillac from 64-67 but there doesn't seem to be much around for increasing power. It has potential as it was rated at 340 hp and I think a torque rating around 390 from the factory with around 10:1 compression. Having owned a few 429's that were factory stock and in better condition than this one I know they can be quite potent.

Cant seem to locate any aftermarket cams, intakes, etc for this motor.

Heres what I had in mind:

Punching the block to .30 or .60 over, getting new pistons, rods etc.
Moving to electronic ignition
Custom cam
Having the heads ported and polished

Also heard of modifying a stock 429 intake to fit a larger Edlebrock carb but I've had pretty good luck with the Quadrajets in the past if they are properly tuned.

Anyone else have any suggestions for this motor. Thanks in advance.
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Old 07-08-2006, 05:16 PM   #8
64deville
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Default Re: Building a more Powerful 429 Cadillac Motor

Dont have an extra drive shaft but mine vibrates like mad too.

I'm kind of coming to realize that working with 429's aint cheap but I like to keep em original. Thought about the 472 swap but havn't looked into too much yet.

A dual quad setup would be cool but expensive. I have AC but it don't care if it works or not, I've got these plates of glass on the side of the car called windows that I usually roll down. Its a summer car anyway.

Its been puffing a lot of blue smoke lately so thats why I'm going to tear into it.
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Old 07-08-2006, 07:54 PM   #9
FEDER
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Default Re: Building a more Powerful 429 Cadillac Motor

I got a 67 - 429 in My Merc. I looked for aftermarket parts and all I found was pertronix ignition and carbs that also are universal.
Mine was a fresh rebuild and has more than enough power. With 279 - 8" single legger rear and the drive line dooin a drumroll on the floor for the first 100 feet it went 15.08 at 97 mph in the qtr. I still have points and the carter carb. Nice thing it gets 14 MPG on the highway. It does need a new dizzy and carb and Im sure it will run MUCH better.Delta could regrind Your cam and then You will need longer pushrods. I dont think Ide bother the stock cam works fine. You might just ring and bearing it,throw in a timing chain. Then do the valves with a little bowl work and a good 3 angle grind. I think You would be happy. Here a pic of a tri power set up I made for the 429. I used old Ford 406 carbs and linkage. Havnt put it on yet it hits the firewall in the Merc. DAM!!!! One of these days we will put it on. FEDER
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